1.The league was founded( in Guang Zhou in 1992)
where was the league founded?
2.They are used for seeing in the dark
( What ) are they used ( for )?
3.We must do something to help her
被动语态： Something must be done to help her.
4.Human has visited the moon so far.
被动语态：The moon has been visited by human so far.
祝你学习进步!